Destroy web_app::ShortcutInfo on UI thread

chrome/browser/web_applications/web_app_mac_unittest.mm

Index: chrome/browser/web_applications/web_app_mac_unittest.mm
diff --git a/chrome/browser/web_applications/web_app_mac_unittest.mm b/chrome/browser/web_applications/web_app_mac_unittest.mm
index 7001f54c8e6d79b3fef05236f60806beb10dee4c..148470b763aea76dc2f7c483a2f60dbfd9aa5e96 100644
--- a/chrome/browser/web_applications/web_app_mac_unittest.mm
+++ b/chrome/browser/web_applications/web_app_mac_unittest.mm
@@ -25,6 +25,7 @@
 #import "chrome/common/mac/app_mode_common.h"
 #include "chrome/grit/theme_resources.h"
 #include "components/version_info/version_info.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
@@ -87,6 +88,9 @@ class WebAppShortcutCreatorTest : public testing::Test {
     shim_path_ = destination_dir_.Append(shim_base_name_);
   }
 
+  // Needed by DCHECK_CURRENTLY_ON in ShortcutInfo destructor.
+  content::TestBrowserThreadBundle thread_bundle_;
+
   base::ScopedTempDir temp_app_data_dir_;
   base::ScopedTempDir temp_destination_dir_;
   base::FilePath app_data_dir_;